I bring up Jack Chick not because you all reference him. (I fully recognize that there are very few Protestant freepers who do bring him up). I bring him up for two reasons:
1) He is a caricature.
2) The accusations he makes are the logical end to the anti-Catholic accusations made here. He takes the "Two Babylons"/ "Babylon Mystery Religion" conspiracy theories and puts them in comic book form.
Hatred of all things Catholic is endemic and at the doctrinal core of most, if not all, Protestant religions (to include those who don't even call themselves Protestant anymore). While not all Protestants may subscribe to those doctrines, that core is there. I posted a thread several days ago where I captured these core doctrines, whether through Westminster, Savoy, Smalcald, or whatever source.
Jack Chick epitomizes those core beliefs beautifully and takes them to their logical conclusion, regardless of how ridiculous his comics appear.